kennytm 4924fea202
Rollup merge of #50511 - Manishearth:must-use, r=QuietMisdreavus
Add some explanations for #[must_use]

`#[must_use]` can be given a string argument which is shown whilst warning for things.

We should add a string argument to most of the user-exposed ones.

I added these for everything but the operators, mostly because I'm not sure what to write there or if we need anything there.
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